package org.wzq;

import javax.servlet.Servlet;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import java.io.File;
import java.io.IOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLStreamHandler;

public class ServletProcessor1 {

    public void process(Request request, Response response) {
        String uri = request.getUri();
        // 请记住 URI 是以下形式的:
        // /servlet/servletName
        String servletName = uri.substring(uri.lastIndexOf("/") + 1);
        URLClassLoader loader = null;
        try {
// create a URLClassLoader
            URL[] urls = new URL[1];
            URLStreamHandler streamHandler = null;
            File classPath = new File(Constants.WEB_ROOT);
// the forming of repository is taken from the
// createClassLoader method in
// org.apache.catalina.startup.ClassLoaderFactory
            String repository = (new URL("file", null, classPath.getCanonicalPath() +
                    File.separator)).toString();
// the code for forming the URL is taken from
// the addRepository method in
// org.apache.catalina.loader.StandardClassLoader.
            urls[0] = new URL(null, repository, streamHandler);
            loader = new URLClassLoader(urls);
        } catch (IOException e) {
            System.out.println(e.toString());
        }
        Class myClass = null;
        try {
            myClass = loader.loadClass(servletName);
        } catch (ClassNotFoundException e) {
            System.out.println(e.toString());
        }
        Servlet servlet = null;
        try {
            servlet = (Servlet) myClass.newInstance();
            servlet.service((ServletRequest) request, (ServletResponse) response);
        } catch (Exception e) {
            System.out.println(e.toString());
        } catch (Throwable e) {
            System.out.println(e.toString());
        }
    }
}